[net-next,v4,16/17] net: pktgen: fix mpls reset parsing

Commit Message

Peter Seiderer Feb. 5, 2025, 1:11 p.m. UTC

Fix mpls list reset parsing to work as describe in
Documentation/networking/pktgen.rst:

  pgset "mpls 0"    turn off mpls (or any invalid argument works too!)

- before the patch

	$ echo "mpls 00000001,00000002" > /proc/net/pktgen/lo\@0
	$ grep mpls /proc/net/pktgen/lo\@0
	     mpls: 00000001, 00000002
	Result: OK: mpls=00000001,00000002

	$ echo "mpls 00000001,00000002" > /proc/net/pktgen/lo\@0
	$ echo "mpls 0" > /proc/net/pktgen/lo\@0
	$ grep mpls /proc/net/pktgen/lo\@0
	     mpls: 00000000
	Result: OK: mpls=00000000

	$ echo "mpls 00000001,00000002" > /proc/net/pktgen/lo\@0
	$ echo "mpls invalid" > /proc/net/pktgen/lo\@0
	$ grep mpls /proc/net/pktgen/lo\@0
	Result: OK: mpls=

- after the patch

	$ echo "mpls 00000001,00000002" > /proc/net/pktgen/lo\@0
	$ grep mpls /proc/net/pktgen/lo\@0
	     mpls: 00000001, 00000002
	Result: OK: mpls=00000001,00000002

	$ echo "mpls 00000001,00000002" > /proc/net/pktgen/lo\@0
	$ echo "mpls 0" > /proc/net/pktgen/lo\@0
	$ grep mpls /proc/net/pktgen/lo\@0
	Result: OK: mpls=

	$ echo "mpls 00000001,00000002" > /proc/net/pktgen/lo\@0
	$ echo "mpls invalid" > /proc/net/pktgen/lo\@0
	$ grep mpls /proc/net/pktgen/lo\@0
	Result: OK: mpls=

Signed-off-by: Peter Seiderer <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
---
Changes v3 -> v4
          - add rev-by Simon Horman

Changes v2 -> v3:
  - new patch
---
 net/core/pktgen.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Patch

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index a46eb20edf6c..434531a3e3c0 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -930,8 +930,13 @@  static int get_labels(const char __user *buffer, int maxlen, struct pktgen_dev *
 
 		max = min(HEX_8_DIGITS, maxlen - i);
 		len = hex32_arg(&buffer[i], max, &tmp);
-		if (len <= 0)
+		if (len < 0)
 			return len;
+
+		// return empty list in case of invalid input and/or zero value
+		if (len == 0 || tmp == 0)
+			return maxlen;
+
 		pkt_dev->labels[n] = htonl(tmp);
 		if (pkt_dev->labels[n] & MPLS_STACK_BOTTOM)
 			pkt_dev->flags |= F_MPLS_RND;